> It's great, but, now I have at least 3 different Powershells in my OS? Why?

Have you never used a Linux distro? I always end up with two windows managers, two login managers, 2-3 shells, 2-3 package managers and what not.

I want to see your 2-3 package managers :-) Unless you count apt, aptitude, apt-get etc separately.

One saving grace with Linux distros is that usually the maintainers package versions that are compatible with each other. So if you stay with the default repos things work.

But yeah once you install newer versions from non-distro repos it might be fine (e.g. git) or things will break in subtle ways.